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Accounts receivable reserves | 12 Months Ended
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Sep. 30, 2016
Receivables [Abstract] |
Accounts receivable reserves | Accounts receivable reserves Changes in the reserves against accounts receivable were as follows (in thousands):
| Year ended September 30,
| 2016 |  | 2015 |  | 2014
Balance at beginning of year | $ | 3,385 |  |  | $ | 3,138 |  |  | $ | 3,828 |
Additions to reserve | 2,335 |  |  | 2,690 |  |  | 1,767 |
Deductions | (1,494 | ) |  | (2,443 | ) |  | (2,457 | )
Balance at end of year | $ | 4,226 |  |  | $ | 3,385 |  |  | $ | 3,138 |
In evaluating the net realizable value of accounts receivable, we consider such factors as current economic trends, customer credit-worthiness, and changes in the customer payment terms and collection trends. Changes in the assumptions used in analyzing a specific account receivable may result in a reserve being recognized in the period in which the change occurs. At September 30, 2016 and 2015, $16.2 million and $12.1 million of our unbilled receivables related to amounts pursuant to contractual retainage provisions. We anticipate that the majority of the fiscal 2016 balance will be collected during the 2017 fiscal year.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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